<template>
  <view>
    <!--使用自定义的搜索组件-->
    <!--这里的@click事件是自定义的,@click也可以是其他名字，不能被直接触发，
    需要在my-search.vue组件里定义一个事件，调用this.$emit('click')-->
    <my-search @click="gotosearch"></my-search>
    
    <view class="scroll-view-container">
      <!--左侧滑动区-->
      <scroll-view class = "left-scroll-view" scroll-y="true" :style=" {height:wh+'px'}">
        <block v-for="(item,i) in cateList" :key = "i">
          <view :class = "['left-scroll-view-item', i === active ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!--右侧滑动区-->
      <scroll-view class = "right-scroll-view" scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
          <view class = "cate-lv2" v-for="(item2,i2) in cateLevel2" :key = "i2">
             <!--二级分类的标题-->
             <view class = "cate-lv2-tilte">/{{item2.cat_name}}/</view>
             <view class = "cate-lv3-list">
                <!--三级分类item项-->
                 <view class = "cate-lv3-item" v-for="(item3,i3) in item2.children"  :key = "i3" @click = "gotoGoodsList(item3)">
                    <!--三级分类的图片-->
                    <image :src = "item3.cat_icon"></image>
                    <!--三级分类的文本-->
                    <text>{{item3.cat_name}}</text>
                 </view>
             </view>
          </view>
      </scroll-view>
    </view>
</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        //当前设备可用高度
         wh:0,
         //一级分类泪飙
         cateList:[],
         active:0,
         //二级分类的列表
         cateLevel2:[],
         scrollTop:0
      };
    },
    onLoad(){
      //动态获取设备信息
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50;
      
      this.getCateList()
    },
    methods:{
     async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        console.log(res)
        this.cateList = res.message
        
        //为二级分类赋值
       this.cateLevel2 =  res.message[0].children
      },
      activeChanged(i){
          this.active = i;
          //重新为二级数组赋值
          this.cateLevel2 = this.cateList[i].children;
          
          this.scrollTop = this.scrollTop === 0 ?1:0;
      },
      //跳转到商品列表页面
      gotoGoodsList(item){
       uni.navigateTo({
         url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
       })
      },
      gotosearch(){
         uni.navigateTo({
           url:'/subpkg/search/search'
         })
      }
    },
    
  }
</script>

<style lang="scss">
 .scroll-view-container{
    display: flex;
 }
 .left-scroll-view{
   
 }
 .left-scroll-view{
   width:120px;
    .left-scroll-view-item{
      background-color: #F7F7F67;
      line-height:60px;
      text-align:center;
      font-size:12px;
      &.active{
        background-color:#FFFFFF;
        position: relative;
        &::before{
          content: ' ';
          display: block;
          width:3px;
          height:30px;
          background-color: #C00000;
          position:absolute;
          top:50%;
          left:0;
          transform: translateY(-50%);
          
        }
      }
    }
 }
 .cate-lv2-tilte{
   font-size: 12px;
   font-weight:bold;
   text-align: center;
   padding:15px 0;
 }
 
 .cate-lv3-list{
   display:flex;
   flex-wrap: wrap;
   .cate-lv3-item{
     width:33.33%;
     display:flex;
     flex-direction: column;
     justify-content: center;
     align-items: center;
     margin-bottom: 10px;
     image{
       width:60px;
       height:60px
     }
     text{
       font-size: 12px;
     }
   }
 }
</style>
